Hiparco Nicaea (190-120 BC)

It was the most important Greek astronomer of his time. He was the director of the Alexandria Library. He was also known as Hiparco of Rhodes.

It is one of the great discoverers. Among his contributions is the first development of a catalog of stars with elliptical coordinates and differentiated by its brightness. This catalog had more than 850 stars and is still used today.

It was also the discoverer of the pressure of the equinoxes. This astronomer relying on its list of stars and their coordinates elliptical realized that the stars changed in length with the passage of time but not latitude.